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Proceedings Paper

Switching speeds in NCAP displays: dependence on collection angle and wavelength
Author(s): Robert H. Reamey; Wayne Montoya; Mark Wartenberg
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Paper Abstract

The on and off switching speeds of nematic droplet-polymer films (NCAP) are shown to depend on the collection angle (f/#) and the wavelength of the light used in the measurement. Conventional twisted nematic liquid crystal displays have switching speeds which depend little on these factors. The switching speed dependence on collection angle (f/#) and wavelength for nematic droplet-polymer films is inherent to the mechanism by which light is modulated in these films. This mechanism is the scattering of light by the nematic droplets. The on times become faster and the off times become slower as the collection angle of detection is increased. The overall change in switching speed can be large. Greater than 100X changes in off time have been observed. As the wavelength of the light used to interrogate the sample is increased (blue yields green yields red) the on times become faster and the off times become slower. This dependence of switching speed on wavelength is apparent at all collection angles. An awareness of these effects is necessary when developing nematic droplet-polymer films for display applications and when comparing switching speed data from different sources.

Paper Details

Date Published: 1 June 1991
PDF: 6 pages
Proc. SPIE 1455, Liquid-Crystal Devices and Materials, (1 June 1991); doi: 10.1117/12.44680
Show Author Affiliations
Robert H. Reamey, Raychem Corp. (United States)
Wayne Montoya, Raychem Corp. (United States)
Mark Wartenberg, Raychem Corp. (United States)


Published in SPIE Proceedings Vol. 1455:
Liquid-Crystal Devices and Materials
Paul S. Drzaic; Uzi Efron, Editor(s)

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